There is a microsoft.public.office.setup newsgroup that would be more
appropriate for this question.

I no experience of such issues, but it would be helpful when reposting
to indicate what exactly the product you were seeking to install was.
For example, if it was a specially priced upgrade product then it would
expect to find an earlier version or a competitive product.

Bill Manville
MVP - Microsoft Excel, Oxford, England
No email replies please - respond to newsgroup